This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
This is based on the FET / Germanium Boost by Chuck D. Bones at the PedalPCB forums: https://forum.pedalpcb.com/threads/this-week-on-the-breadboard-fet-germanium-boost.9281/
This repository contains:
- A gerber file to produce the PCB.
- A gerber file to produce the PCB with a location specified for the production number if using JLCPCB.
- A schematic.
There is no support supplied or guaranteed for the PCB. I have built it and it works, YMMV.
- There is no on-board LED. Take the positive (+) output at the bottom of the board, connect it to a CLR of your choice (start with 4K7) and then to the LED and from LED to your footswitch. This is documented around the interwebs.
- Use a SMD for the JFET. The uniformity of SMD components is better than through-hole. The board is marked for 2N5457 but many will work (2N5246, J201, 2SK30A-D). Look for a Vp of ~1.4V
- The NPN Germanium transistor is not too picky. You can tweak the 39K resistor to adjust the collector voltage. I used 2N1304 instead of the original 2N1308, but MP38A have also been used to great effect.
- Voice:
- Down - Gain increased 10dB across the frequency range, with gradual bass roll-off below 200Hz. Adjust the 2u2 capacitor for fatter bottom-end.
- Center - Flat frequency response. Gain from 11dB to 40dB. Clean with gain below noon.
- Up - Treble booster. Bass roll-off below 450Hz. Clean with gain below 10:00.
The Texel sheep comes from the island of Texel, off the northern Dutch coast.
It is a hardy stock and a great meat breed, finding favour in NZ, Australia, and the UK.
It is a white-faced breed with no wool on the head or legs. It has a short, wide face with a black nost and widely placed, short ears and black hooves.
They have exceptional muscle development and lean fat.